#include<iostream>
#include<vector>
#include<queue>
#include<cstring>
#include<cmath>
#include<map>
#include<set>
#include<cstdio>
#include<algorithm>
#define debug(a) cout<<#a<<"="<<a<<endl;
using namespace std;
const int maxn=2e5+1000;
typedef long long LL;
inline LL read(){LL x=0,f=1;char ch=getchar();	while (!isdigit(ch)){if (ch=='-') f=-1;ch=getchar();}while (isdigit(ch)){x=x*10+ch-48;ch=getchar();}
return x*f;}
int main(void){
   cin.tie(0);std::ios::sync_with_stdio(false);
   LL T;cin>>T;
   while(T--){
      LL A,B;cin>>A>>B;
      LL num=0;LL temp=0;
      for(LL i=1;i<=12;i++){
         temp=temp*10+9;
         if(temp<=B){
            num++;
         }
         else{
            break;
         }
      }
      LL sum=0;
      for(LL i=1;i<=num;i++){
         sum+=A;
      }
      cout<<sum<<"\n";
   }
   return 0;
}
